The Kamerun campaign took place in the German colony of Kamerun in the African theatre of the First World War when the British, French and Belgians invaded the German colony from August 1914 to March 1916. Most of the campaign took place in Kamerun but skirmishes also broke out in British Nigeria. By the Spring of 1916, following Allied victories, the majority of German troops and the civil administration fled to the neighbouring neutral colony of Spanish Guinea. The campaign ended in a defeat for Germany and the partition of its former colony between France and Britain.

Kamerun was an African colony of the German Empire from 1884 to 1920 in the region of today's Republic of Cameroon. Kamerun also included northern parts of Gabon and the Congo with western parts of the Central African Republic, southwestern parts of Chad and far northeastern parts of Nigeria.